Removing deprecated info for external Speed docs.

Appropriate email lists will be added later once figured out.

- Replaced benchmarking-dev@ with crouleau@ (same as in the Speed Ops doc)
- Removed email contacts of people no longer on Speed Services
- Remove rschoen@ from OWNERS

crbug/909866 will now be used to track all remaining updates in external Speed docs. TODOs noted there.

R=benhenry@chromium.org, crouleau@chromium.org, sullivan@chromium.org

Bug: 909866
Change-Id: Ifa961e1c65aefeafe92194e9dc9a32b27f65b55a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1544789
Commit-Queue: Ushesh Desai <ushesh@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645510}

docs/speed/OWNERS

@@ -1,4 +1,4 @@
 sullivan@chromium.org
 benhenry@chromium.org
-rschoen@chromium.org
+ushesh@chromium.org
 per-file apk_size_regressions.md=agrieve@chromium.org

docs/speed/adding_tests_bots.md

@@ -8,4 +8,4 @@ See the
 ## Adding hardware
 
 This documentation is under construction. In the meantime, please reach out to
-benchmarking-dev@chromium.org.
+crouleau@chromium.org.

docs/speed/chrome_speed_services.md

@@ -1,9 +1,8 @@
 # Speed Operations: Services
 
-TL: simonhatch@<br>
-Team: simonhatch@ benjhayden@, dtu@, eakuefner@<br>
-TPM: benhenry@<br>
-Mailing List: speed-services-dev@chromium.org<br>
+TL: simonhatch@chromium.org<br>
+Team: simonhatch@chromium.org, dberris@chromium.org, benjhayden@chromium.org<br>
+TPM: benhenry@chromium.org, ushesh@chromium.org<br>
 **[go/chrome-speed-services](https://goto.google.com/chrome-speed-services)**
 
 ## Mission